Pumps – Condition responsive control of drive transmission or pump... – Having condition responsive pumped fluid control
Patent
1994-05-03
1996-05-07
Hepperle, Stephen M.
Pumps
Condition responsive control of drive transmission or pump...
Having condition responsive pumped fluid control
60452, 137116, F04B 4908
Patent
active
055139582
ABSTRACT:
An accumulator charging valve has a first valve spool determining a cut-in pressure level at which fluid from a pump is directed to an accumulator and a second valve spool determining the cut-out pressure level at which fluid is no longer directed to the accumulator. When the pressure at the accumulator reaches a predetermined high level, the second valve spool moves to a position communicating an inlet port with an intermediate passage. The first spool is normally at a position blocking the intermediate passage from an outlet port so that a flow path is established through a pair of orifices reducing the pressure in the intermediate passage and the inlet port. The reduced pressure is transmitted to an actuating chamber to hold the second valve spool in the above noted position and to a pump displacement controller to destroke the pump to a low standby pressure displacement. When the pressure at the accumulator drops to a predetermined low level, the first valve spool moves to a position communicating the intermediate passage with the outlet port venting the actuating chamber so that the second valve spool moves to a position blocking the inlet port from the intermediate passage. This increases the pressure directed to the displacement controller upstroking the pump to a high pressure displacement. The cycle is repeated when the pressure reaches the predetermined high level.
REFERENCES:
patent: 3024732 (1962-03-01), Nyman
patent: 3329153 (1967-07-01), Henry-Biabaud
patent: 3570519 (1971-03-01), Bianchetta
patent: 4114637 (1978-09-01), Johnson
patent: 4173866 (1979-11-01), Farr
patent: 4665697 (1987-05-01), Dantlgraber
patent: 4699571 (1987-10-01), Bartholomaus
Article "17 Series Hydraulic Unloading Relief Valves" by United Technologies Automotive, A-4.01 published Jan. 1, 1990.
Article "Pressure Unloading Valve" M1A125, M1B125, by Sterling Hydraulics Limited, Drg. No. Asv 010802.
Article--"Differential Area Unloading Relief Valve", series RU101, by Parker Hannifin Corporation, pp. 35-36.
Caterpillar Inc.
Grant John W.
Hepperle Stephen M.
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